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I'd initially supposed that predicate_refuted_by(..., true) ought to say that "A refutes B" means "non-falsity of A implies non-truth of B". But it seems better to define it as "truth of A implies non-truth of B". This is more useful in the current system, slightly easier to prove, and in closer correspondence to the existing code behavior. With this change, test_predtest no longer claims that any existing test cases show false proof reports, though there still are cases where we could prove something and fail to. Discussion: https://postgr.es/m/5983.1520487191@sss.pgh.pa.us |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.